Power button issue

[MrAvenger]

Anyone else have a issue either the power button not turning the screen on?
Alot of the time when I press the blue button the screen doesnt turn on.. I have to press it twice or three times.
It only seems to be a screen wake up issue as the screen always turns off when I press the button.
Anyone experiencing the same issue?

[MrAvenger]

OK I'm having a hunch it could be something with the following sensor.

As soon as I do this test the z+ axis lights up but cant get the z- one to work. So how do I recalibrate it?